Translation of the "Epigramma XXI":
"From man and woman, make you a single circle
From which rises the square with its equal sides
Build a triangle of it, turned itself
In a rounded sphere. The Stone then is born.
If your mind is slow to catch that mystery,
Understand the work of the geometer and you will know."
Let's follow the shadows of the character's compasses:
It delimits the proportions of a sacred triangle (3-4-5)
(notice that the lower shadow shows the diagonal equal to sqrt5)
Now let see the Giza complex:
With symmetry you can draw a sacred triangle (3-4-5) including Kheops and Menkaure.
Now place Atalanta on the Giza complex:
and you obtain the exact location of the head of the Sphinx.
For more, I invite you to read (french):
"Le Grand Secret des Pyramides de Guizeh"
"Le Grand Secret du Sphinx de Guizeh"
"Guizeh, au-delà des Grands Secrets"
from Guy Gruais and Guy Mouny (edition du Rocher).